The difference is having skin in the game. The problems with reddit didn't really effect a lot of the users directly and definitely didn't threaten most of their livelihoods (aside from a small number of app developers). Unity on the other hand is a tool people use to make a living and when it threatens that I imagine it will result in much more hesitancy to continue using it.
For new projects it's absolutely a terrible idea to use Unity. The old versions not being subject to the new licensing is great news for existing projects that wouldn't have been able to switch engines though.
Camels are pretty dang well designed creatures so I'd say the committee did pretty great there. And the alternative is being at the whims of a single person or a small group none of whom have any incentive to care about anything other than the enrichment of their own personal finances. It's a literal autocracy.
Governance structures where the workers own and have a say in the means of production are bound to have their own issues to be sure, but it beats out the current model.